A146713 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 21, 47, 295, 1465, 7767, 65051, 795933, 8973805, 164427495, 3016356659, 81769439115

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.1.1.0.0.0.0
.0.0.1.1.1.1.0.0
.0.0.0.1.0.0.1.1
.0.1.0.0.1.1.1.1
.1.1.1.1.0.0.1.0
.1.1.0.0.1.0.0.0
.0.0.1.1.1.1.0.0
.0.0.0.0.1.1.0.0

Crossrefs

Sequence in context: A327302 A156966 A146705 * A140681 A262423 A020178

Adjacent sequences: A146710 A146711 A146712 * A146714 A146715 A146716

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved